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US 6,188,850 B1Granted
Printing paper and method of image formation employing the same
AssigneeCanon Kabushiki Kaisha
InventorsMamoru Sakaki, Akio Suzuki, Masayoshi Takahashi, Yoshinobu Shimomura, Tatsuo Takeuchi, Yoshihiro Takada, Masato Katayama
Life of this patent
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Abstract
A neutralized printing paper which is made of a base paper and a cationic compound applied on a printing surface of the base paper. The paper has a surface pH value ranging from 6.0 to 7.5.
Claims16
A neutralized printing paper comprising a base paper and a cationic compound and starch applied on a printing surface of the base paper, and having a surface pH value ranging from 6.0 to 7.5, and a Stöckigt sizing degree of from 16 to 40 seconds,
- wherein the pH value of an interior of the neutralized printing paper is not lower than the surface pH value, and
- wherein the cationic compound is a strong acid salt of a compound having a functional group selected from the group consisting of primary, secondary, and tertiary amino, quaternary ammonium, pyridyl, pyridinium, imidazolyl, imidazolinium, sulfonium, and phosphonium.
A process for preparing a neutralized printing paper comprising the steps of:
- providing a base paper having a pH value, and
- applying onto the base paper a coating solution which comprises a cationic compound and which has a pH value smaller than the pH value of the base paper,
- wherein the cationic compound is a strong acid salt of a compound having a functional group selected from the group consisting of primary, secondary, and tertiary amino, quaternary ammonium, pyridyl, pyridinium, imidazolyl, imidazolinium, sulfonium, and phosphonium.
Dependencies are inferred from the claim text.